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Adjective: effectual  i'fek-choo-ul
  1. Producing or capable of producing an intended result or having a striking effect
    "his complaint proved to be effectual in bringing action";
    - effective, efficacious
  2. Having legal efficacy or force
    - legal, sound

See also: effectiveness, effectivity, effectuality, effectualness, efficacious, efficient, hard-hitting, impelling, impressive, potent, powerful, rough-and-ready, stiff, strong, telling, trenchant, useful, utile, valid